fix setuptools_scm LookupError bug

If setuptools_scm is installed but gwinc is not called from the gwinc directory, a LookupError was previously thrown. Now the version is set to '?.?.?' in this case.

gwinc/__init__.py

@@ -16,7 +16,7 @@ except ModuleNotFoundError:
             __version__ = '?.?.?'
     # FIXME: fallback_version is not available in the buster version
     # (3.2.0-1)
-    except (ModuleNotFoundError, TypeError):
+    except (ModuleNotFoundError, TypeError, LookupError):
         __version__ = '?.?.?'
 from .ifo import IFOS
 from .struct import Struct